[evolution/gnome-3-18] Bug 752543 - Left tooltip from preview panel when mouse leaves it

[Milan Crha <mcrha src gnome org>]

commit 93c40f6c067a19ffd4f134aee404e9e1468bea16
Author: Milan Crha <mcrha redhat com>
Date:   Fri Nov 27 16:12:53 2015 +0100

    Bug 752543 - Left tooltip from preview panel when mouse leaves it

 e-util/e-web-view.c |   57 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 57 insertions(+), 0 deletions(-)
---
diff --git a/e-util/e-web-view.c b/e-util/e-web-view.c
index e42b018..4bdeccf 100644
--- a/e-util/e-web-view.c
+++ b/e-util/e-web-view.c
@@ -81,6 +81,8 @@ struct _EWebViewPrivate {
        /* To workaround webkit bug:
         * https://bugs.webkit.org/show_bug.cgi?id=89553 */
        EWebViewZoomHackState zoom_hack_state;
+
+       gboolean has_hover_link;
 };
 
 struct _AsyncContext {
@@ -550,6 +552,8 @@ web_view_hovering_over_link_cb (EWebView *web_view,
 {
        EWebViewClass *class;
 
+       web_view->priv->has_hover_link = uri && *uri;
+
        /* XXX WebKitWebView does not provide a class method for
         *     this signal, so we do so we can override the default
         *     behavior from subclasses for special URI types. */
@@ -1501,6 +1505,57 @@ web_view_disable_webkit_3rd_party_plugins (gpointer unused)
 }
 
 static void
+web_view_toplevel_event_after_cb (GtkWidget *widget,
+                                 GdkEvent *event,
+                                 EWebView *web_view)
+{
+       if (event && event->type == GDK_MOTION_NOTIFY && web_view->priv->has_hover_link) {
+               GdkEventMotion *motion_event = (GdkEventMotion *) event;
+
+               if (gdk_event_get_window (event) != gtk_widget_get_window (GTK_WIDGET (web_view))) {
+                       GdkEventMotion fake_motion_event;
+                       gboolean result = FALSE;
+
+                       fake_motion_event = *motion_event;
+                       fake_motion_event.x = -1.0;
+                       fake_motion_event.y = -1.0;
+                       fake_motion_event.window = gtk_widget_get_window (GTK_WIDGET (web_view));
+
+                       /* Use a fake event instead of the call to unset the status message, because
+                          WebKit caches which link it stays on and doesn't emit the signal when still
+                          moving about the same link, thus this will unset the link also for the WebKit. */
+                       g_signal_emit_by_name (web_view, "motion-notify-event", &fake_motion_event, &result);
+
+                       web_view->priv->has_hover_link = FALSE;
+               }
+       }
+}
+
+static void
+web_view_map (GtkWidget *widget)
+{
+       GtkWidget *toplevel;
+
+       toplevel = gtk_widget_get_toplevel (widget);
+
+       g_signal_connect (toplevel, "event-after", G_CALLBACK (web_view_toplevel_event_after_cb), widget);
+
+       GTK_WIDGET_CLASS (e_web_view_parent_class)->map (widget);
+}
+
+static void
+web_view_unmap (GtkWidget *widget)
+{
+       GtkWidget *toplevel;
+
+       toplevel = gtk_widget_get_toplevel (widget);
+
+       g_signal_handlers_disconnect_by_func (toplevel, G_CALLBACK (web_view_toplevel_event_after_cb), 
widget);
+
+       GTK_WIDGET_CLASS (e_web_view_parent_class)->unmap (widget);
+}
+
+static void
 e_web_view_class_init (EWebViewClass *class)
 {
        GObjectClass *object_class;
@@ -1518,6 +1573,8 @@ e_web_view_class_init (EWebViewClass *class)
        widget_class = GTK_WIDGET_CLASS (class);
        widget_class->scroll_event = web_view_scroll_event;
        widget_class->drag_motion = web_view_drag_motion;
+       widget_class->map = web_view_map;
+       widget_class->unmap = web_view_unmap;
 
        class->create_plugin_widget = web_view_create_plugin_widget;
        class->hovering_over_link = web_view_hovering_over_link;